SE418234B - POWER TRANSFORMER OR REACTOR - Google Patents

POWER TRANSFORMER OR REACTOR

Info

Publication number
SE418234B
SE418234B SE7906766A SE7906766A SE418234B SE 418234 B SE418234 B SE 418234B SE 7906766 A SE7906766 A SE 7906766A SE 7906766 A SE7906766 A SE 7906766A SE 418234 B SE418234 B SE 418234B
Authority
SE
Sweden
Prior art keywords
winding
conductor
transformer
reactor according
strip
Prior art date
Application number
SE7906766A
Other languages
Swedish (sv)
Other versions
SE7906766L (en
Inventor
B Moritz
O Tonnesen
Original Assignee
Asea Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asea Ab filed Critical Asea Ab
Priority to SE7906766A priority Critical patent/SE418234B/en
Priority to CH534280A priority patent/CH655600B/de
Priority to DE3029416A priority patent/DE3029416C2/en
Priority to FR8017655A priority patent/FR2463492B1/en
Priority to BE0/201704A priority patent/BE884717A/en
Priority to US06/176,918 priority patent/US4323870A/en
Priority to ZA00804909A priority patent/ZA804909B/en
Priority to JP11097180A priority patent/JPS5630711A/en
Priority to GB8026441A priority patent/GB2057776B/en
Priority to CA000358186A priority patent/CA1150375A/en
Publication of SE7906766L publication Critical patent/SE7906766L/en
Publication of SE418234B publication Critical patent/SE418234B/en
Priority to US06/354,391 priority patent/US4471335A/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2847—Sheets; Strips
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2847—Sheets; Strips
    • H01F2027/2857—Coil formed from wound foil conductor

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Insulating Of Coils (AREA)
  • Regulation Of General Use Transformers (AREA)

Description

''''''' _ ÛUFTGGIÉ' 10 15 25 'as - I - . - ~. I -~~~- '-- w» .-_~~--.--:-.-.-» -.---~~- t. ...___-gen _. .- Ändamålet med föreliggande uppfinning är att åstadkomma en bättre lösning på ovannämnda strömförträngxairlgeproblem än de tidigare föreslagna. Detta uppnås genom den i känneteclmande delen av patentlcrav 1 angivna åtgärden. '' '' '' '_ ÛUFTGGIÉ' 10 15 25 'as - I -. - ~. I - ~~~ - '- w ».-_ ~~ --.--: -.-.-» -.--- ~~ - t. ...___- gen _. The object of the present invention is to provide a better solution to the above-mentioned current congestion problems than the ones previously proposed. This is achieved by the measure specified in the characterizing part of claim 1.

Uppfinningens grundidá är att man, i stället för att försöka påverka fältet, låter ledarmaterialet följa. fältet, dvs formar bandet eller folien på sådant sätt, att fältvektorn i varje punkt är tangent till le- darytan. I princip kan man helt eliminera 'strömförträngningen på. detta sätt.The basic idea of the invention is that, instead of trying to influence the field, the conductor material is allowed to follow. the field, ie shapes the band or foil in such a way that the field vector at each point is tangent to the conductor surface. In principle, one can completely eliminate the 'current constraint on. this way.

En transformator- eller reaktorlindning enligt uppfinningen har iregel en trattformig utböjning vid ändarna. Denna utböjning åstadkommes lämpli- gen genom att lindningen lindas av en metallfolie, där foliekanterna är dubbelvikta (dvs vikta 180°). En sådan omvikt kant ger dessutom fördelar i form av minskad risk för glimning vid bandkanten, ökat leden-tvärsnitt och därmed bättre fyllfaktor, styvare lindningskonstruktion och oskadlig- gör-ande av gader från skärningen av bandet.A transformer or reactor winding according to the invention generally has a funnel-shaped deflection at the ends. This deflection is conveniently effected by winding the winding with a metal foil, where the foil edges are double-folded (ie folded 180 °). Such a folded edge also provides advantages in the form of reduced risk of glare at the strip edge, increased joint cross-section and thus a better filling factor, stiffer winding construction and neutralization of streets from the cutting of the strip.

Uppfinningen skall närmare beskrivas i anslutning till ett antal i bifogade ritning visade ntföringsexempel, varvid fig 1 visar schematiskt, för illustration av uppfinningens princip, ett snitt genom övre delen av två omkring ett kärnben anordnade folie- lindningar, fig 2 visar på motsvarande sätt ett alternativt utförande som är fördelak- tigare ur tillverkningsteknisk synpunkt, fig 5, 4 och 5 visar olika lösningar för åstadkommande av en trattformig utböjníng av lindningsändama.The invention will be described in more detail in connection with a number of exemplary embodiments shown in the accompanying drawing, wherein Fig. 1 shows schematically, for illustration of the principle of the invention, a section through the upper part of two foil windings arranged around a core bone, Fig. 2 correspondingly shows an alternative embodiments which are more advantageous from a manufacturing point of view, Figs. 5, 4 and 5 show different solutions for producing a funnel-shaped deflection of the winding ends.

I fig 1 visas 'en del av en transformatorkärna med kärnben 1 och ok 2. Kon- centriskt .omkring käïrnbenet 1 har anordna-ts en inner-lindning 5 och en ytter- lindning 4. Lindningarna är uppbyggda av i flera varv spirallindade alumi- nium- eller kopparfolier 5 resp 6, vars tjocklek kan ligga mellan 0,03 och 5 mm, företrädesvis mellan 0,1 och 1 m. Mellan lindningsvarven ligger en film av lämpligt isolermaterial, exempelvis polyetylenglykoltereftalat, vars tjocklek exempelvis kan ligga mellan 0,01 och 0,05 mm. Den inre lindningen 3 är lindad på ett på kärnbenet 1 fixerat rör 7 av t ex glasfiberamerad plast.Fig. 1 shows a part of a transformer core with core bone 1 and yoke 2. Concentrically around the core bone 1 an inner winding 5 and an outer winding 4 have been arranged. The windings are built up of spirally wound aluminum in several turns. nium or copper foils 5 and 6, respectively, the thickness of which may be between 0.03 and 5 mm, preferably between 0.1 and 1 m. Between the winding turns is a film of suitable insulating material, for example polyethylene glycol terephthalate, the thickness of which may be between 0.01 and 0.05 mm. The inner winding 3 is wound on a tube 7 of, for example, fiberglass-reinforced plastic fixed to the core bone 1.

Den yttre lindningen 4 är i sin tur lindad på. ett på. den inre lindningen anordnat rör 8 av isolermaterial.The outer winding 4 is in turn wound on. one on. the inner winding arranged tube 8 of insulating material.

I fig 1 har det genom lindning-arna gående läckflödet antytts genom streckade 10 15 20 25 50 7906766-6 linjer 9. Lindningaznas ändpartier har formats så. att folierna 5 och 6 i huvudsak följer flödeslinjerna. Då. flödet därvid inte får någon vinkel- rätt mot folierna riktad komposant, förhindras bildandet av virvelström- mar i lindningsledarxxa, så att dessa får en i huvudsak konstant strömtät- het över ledartvärsnittet.In Fig. 1, the leakage flow passing through the windings has been indicated by dashed lines 9. The end portions of the winding axes have been formed as follows. that the foils 5 and 6 substantially follow the flow lines. Then. the flow thereby does not have a component perpendicular to the foils, the formation of eddy currents in the winding conductor x is prevented, so that these have a substantially constant current density over the conductor cross-section.

Det i fig 1 visade utförandet, vid vilket irmerlindnjngens 3 ändparti är inåtböjt, har nackdelar ur produktionsteknisk synpunkt. Dessa kan undvikas genom det utförande som visas i fig 2, där den inre lindningens 3 ledare har rakt tvärsnitt. Den närmast kärnbenet belägna delen av denna lindning har större axiell längd än den övriga delen av lindningen och bildar därvid en cylindrisk skärm 10, varigenom en upprätning av läckflödet närmast kärn- 'benet åstadkommes (jfr svenska patentansökningar: 7804989-8). Den yttre lindningen 4 däremot har en trattformig utböjning, så. att lindningens le- darfolie 6 i huvudsak följer flödeslinjenze för det resulterande magnetiska läckflödet.The embodiment shown in Fig. 1, in which the end portion of the inner winding 3 is bent inwards, has disadvantages from a production technical point of view. These can be avoided by the embodiment shown in Fig. 2, where the conductor of the inner winding 3 has a straight cross-section. The part of this winding located closest to the core bone has a greater axial length than the rest of the winding and thereby forms a cylindrical screen 10, whereby a correction of the leakage flow closest to the core bone is achieved (cf. Swedish patent applications: 7804989-8). The outer winding 4, on the other hand, has a funnel-shaped deflection, so. that the conductor foil 6 of the winding substantially follows the flow line of the resulting magnetic leakage current.

Eftersom det utrymme som står till förfogande för en transformator- eller reaktorlindzzing normalt har formen av en cirkulär hålcylinder, är det lämp- ligt att den yttre lindningens 4 krökta. kantpartier utformas med hänsyn till detta, se att linaningsutrymme: maximalt utnyttjas (jfr rig 2). I vissa fall kan det dock vara lämpligt att den yttre lindningen utföres med en maa ökande radie avtagande asien länge (Jfr fi; 1).Since the space available for a transformer or reactor winding normally has the shape of a circular hollow cylinder, it is suitable for the outer winding 4 to be curved. edge sections are designed with this in mind, see that lining space: maximum utilization (cf. rig 2). In some cases, however, it may be appropriate for the outer winding to be carried out with a slightly increasing radius decreasing over a long time (cf. fi; 1).

Det genom ledarbsndets krökning i radiell led uppkomna disponibla utrymmet vid lindningsändarna utfylles lämpligen med elektriskt ledande material.The available space at the winding ends resulting from the curvature of the conductor wire in a radial direction is suitably filled with electrically conductive material.

Därigenom uppnås en ytterligare reducering av strömtätheten i det lcritiska området vid lindningsändarna.Thereby a further reduction of the current density in the critical area at the winding ends is achieved.

Fig 5 visar ett utförirzgsexempel av den yttre lindningens ändparti med av aluminiumfolie bestående lindningsband 6 och mellan lindningsvarven liggande isolerfilm 11. Av fig 5 framgår hur den trattformiga utböjningen av ändpar- tiet kan åstadkommas genom att använda folie med dubbelvikta kanter. Genom att variera bredden b hos det invikta kantpartiet kan trattformen optimeras i viss mån med avseende på. läckflödets konfiguration. Man kan även valea det omvikta kantpartiet för att åstadkomma en bandtjocklek vid kanten, som är mindre än 2 ggr folietjeckleken.Fig. 5 shows an embodiment of the end portion of the outer winding with winding strip 6 consisting of aluminum foil and insulating film 11 lying between the winding turns. Fig. 5 shows how the funnel-shaped deflection of the end portion can be achieved by using foil with double-folded edges. By varying the width b of the folded edge portion, the funnel shape can be optimized to some extent with respect to. leakage flow configuration. You can also select the folded edge portion to provide a strip thickness at the edge that is less than 2 times the foil thickness.

Fig 4 visar ett utförande där ledarbandet 6 utgöres av två. parallella direktFig. 4 shows an embodiment where the guide band 6 consists of two. parallel direct

Claims (10)

vsoevse-6 4 10 mot varandra liggande folier 6a och 6b, vardera med halva ledarbsndets tjocklek. Båda foliezma har dubbel-vikta kanter, och de invikta partierna hos folierna är vända mot varandra. och är olika breda. Genom detta ut- förande uppnås att ökningen av bandtjockleken mot kanten sker i två steg, varvid även bättre iyllfalctor uppnås. - Fig 5 visar ett utförande där det disponibla utrymmet längs bandkanten utfirllts av en tillsammans med ledarfolien 6 lindad extra folieremsa 12 med kilformigt tvärsnitt. Sådana. folieremsor kan man givetvis även använda vid utföringsformerna enligt fig 5 och 4 för att variera bandkantens tjock- lek. Dessa remsor placeras därvid lämpligen inuti det omvikta kantpartiet. PAEEENTKBAVfacing foils 6a and 6b, each with half the thickness of the conductor strip. Both foiezmas have double-folded edges, and the folded-in portions of the foils face each other. and are different widths. Through this design, it is achieved that the increase in strip thickness towards the edge takes place in two steps, whereby even better wool falcons are achieved. Fig. 5 shows an embodiment where the available space along the band edge is formed by an additional foil strip 12 with wedge-shaped cross-section wound together with the conductor foil 6. Such. foil strips can of course also be used in the embodiments according to Figs. 5 and 4 to vary the thickness of the strip edge. These strips are then suitably placed inside the folded edge portion. PAEEENTKBAV 1. Krafttransformator eller reaktor omfattande en av magzetiskt material bestående kärna med åtminstone ett ben (1) och ok (2) samt åtminstone en lindning (4) av bandformigt ledarmatsrial (6), anordnad i huvudsak koncent- riskt omkring käz-nbenet (1), k ä n n e t e c k n a d därav, att ledar- bandet (6) vid sina kantpartier, åtminstone i ett område vid lindningens (4) periferi, följer en dubbelkrökt yta.A power transformer or reactor comprising a core consisting of magnetic material with at least one leg (1) and yoke (2) and at least one winding (4) of band-shaped conductor material (6), arranged substantially concentrically around the core leg (1). ), characterized in that the conductor band (6) at its edge portions, at least in an area at the periphery of the winding (4), follows a double-curved surface. 2. Transfomator eller reaktor enligt patentkrav 1, k ä n n e t e c k - n a d därav, att de närmast oken belägna partierna av lindningen är formade på sådant sätt, att ledarbandet (6) i huvudsak följer de flödeslinjer (9) för det resulterande magnetiska läokflödet som svarar mot konstant strömtätbet i bandet (6).Transformer or reactor according to Claim 1, characterized in that the nearest oily portions of the winding are shaped in such a way that the conductor band (6) substantially follows the flow lines (9) of the resulting magnetic leakage current which correspond to against constant current tightness in the band (6). 3. Transformator eller reaktor enligt patentkrav 1 eller 2, k ä. n n e - 1; e c k n a a därav, att linaningen omfatta: en inre lmaningsael (5) mn en radiellt utanför den inre lindningsdelen belägen yttre lindningsdel (4), varvid ledarbandet i ett omrâde vid varje lindning-sände i den yttre lind- ningsdelen (4) uppvisar ett i riktning mot bandkanten successivt ökande avstånd 'från lindningens (5, 4) geometriska axel.A transformer or reactor according to claim 1 or 2, characterized by n - 1; characterized in that the winding comprises: an inner winding member (5) having an outer winding part (4) located radially outside the inner winding part, the conductor band in an area at each winding end in the outer winding part (4) having a direction towards the band edge gradually increasing distance 'from the geometric axis of the winding (5, 4). 4. Transformator eller reaktor enligt patentkrav 3, k ä n n e t e c k - n a d därav, att lindningsbandets tvfärsnittslcrökning i den yttre lindningfi- delens (4) ândpartier 'ökar med ökande avstånd från lindningens (51 4) geo- metriska axel. 7906766-64. A transformer or reactor according to claim 3, characterized in that the cross-sectional curvature of the winding strip in the end portions' of the outer winding part (4) increases with increasing distance from the geometric axis of the winding (51 4). 7906766-6 5. Tmsfomator eller reaktor enligt något av föregående patentkrav, kännetecknad därav, att lindningen (4) harenmed ökande radie avtagande axiell längd.Thermometer or reactor according to one of the preceding claims, characterized in that the winding (4) has a decreasing axial length with increasing radius. 6. Transformator eller reaktor enligt patentkrav 3, 4 eller 5, k ä n n e t e c k n a d därav, att lindningens krökta kantpaztier är så utformade, att den yttre lindningsdelen (4) i huvudsak ufyller en cirkulär hålcylindriek volym.Transformer or reactor according to claim 3, 4 or 5, characterized in that the curved edge passages of the winding are designed such that the outer winding part (4) substantially fills a circular hollow cylindrical volume. 7. ,. Transformator eller reaktor enligt något av föregående patentlcrav, k ä n n e t e o k n a d därav, att det genom leder-bandets (6) tväranitts- lmölming i radiell led uppkomna disponibla utrymmet vid lindningsändanm är utfyllt av elektriskt ledande material.7.,. Transformer or reactor according to one of the preceding patent claims, characterized in that the available space at the end of the winding strip (6) in the radial direction of the conductor belt (6) is filled with electrically conductive material. 8. Transformator eller reaktor enligt patentkrav 7, k ä n n e t e e k - n a d därav, att ledarbandets (6) kanter är dubbelvikta.Transformer or reactor according to Claim 7, characterized in that the edges of the conductor strip (6) are double-folded. 9. Transformator eller reaktor enligt patentkrav 7 eller 8, k ä n n e - t e c k n a. d därav, att ledarbandet (6) utgöres av flera parallella, med flazsiaom mot varandra liggande aelbana (se, eb) med aubbelvirta kanter, varvid de invikta partierna hos olika delband är olika. breda.Transformer or reactor according to Claim 7 or 8, characterized in that the conductor strip (6) consists of several parallel, parallel planes (see, eb) with aubbelvirta edges, the folded-in portions in different subbands are different. breda. 10. Transformator eller reaktor enligt patentkrav 7, 8 eller 9, k ä n n e t e c k n a d därav, att längs -ledarbandets kanter anordnats separata elektriskt ledande remsor (12), företrädesvis med kilformigt tvärsnitt, för utfyllning av nämnda disponibla utrymme.Transformer or reactor according to claim 7, 8 or 9, characterized in that separate electrically conductive strips (12), preferably with a wedge-shaped cross-section, are arranged along the edges of the conductor band, for filling in said available space.
SE7906766A 1979-08-14 1979-08-14 POWER TRANSFORMER OR REACTOR SE418234B (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
SE7906766A SE418234B (en) 1979-08-14 1979-08-14 POWER TRANSFORMER OR REACTOR
CH534280A CH655600B (en) 1979-08-14 1980-07-11
DE3029416A DE3029416C2 (en) 1979-08-14 1980-08-02 Power transformer or reactor
US06/176,918 US4323870A (en) 1979-08-14 1980-08-11 Transformer or reactor having a winding formed from sheet material
BE0/201704A BE884717A (en) 1979-08-14 1980-08-11 TRANSFORMER OR COIL
FR8017655A FR2463492B1 (en) 1979-08-14 1980-08-11 TRANSFORMER OR COIL
ZA00804909A ZA804909B (en) 1979-08-14 1980-08-12 Transformer or reactor
JP11097180A JPS5630711A (en) 1979-08-14 1980-08-12 Stationary inductance device
GB8026441A GB2057776B (en) 1979-08-14 1980-08-13 Transformer or reactor having a winding formed from sheet material
CA000358186A CA1150375A (en) 1979-08-14 1980-08-13 Transformer or reactor having a winding formed from sheet material
US06/354,391 US4471335A (en) 1979-08-14 1982-03-03 Transformer or reactor having a winding formed from sheet material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7906766A SE418234B (en) 1979-08-14 1979-08-14 POWER TRANSFORMER OR REACTOR

Publications (2)

Publication Number Publication Date
SE7906766L SE7906766L (en) 1981-02-15
SE418234B true SE418234B (en) 1981-05-11

Family

ID=20338616

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7906766A SE418234B (en) 1979-08-14 1979-08-14 POWER TRANSFORMER OR REACTOR

Country Status (10)

Country Link
US (2) US4323870A (en)
JP (1) JPS5630711A (en)
BE (1) BE884717A (en)
CA (1) CA1150375A (en)
CH (1) CH655600B (en)
DE (1) DE3029416C2 (en)
FR (1) FR2463492B1 (en)
GB (1) GB2057776B (en)
SE (1) SE418234B (en)
ZA (1) ZA804909B (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE428979B (en) * 1981-02-24 1983-08-01 Asea Ab WITH INSULATED COOL TRANSFORMER OR REACTOR
SE435330B (en) * 1983-02-10 1984-09-17 Asea Ab INDUCTIVE DEVICE
JPS60169757U (en) * 1984-04-19 1985-11-11 アルプス電気株式会社 disk clamp device
SE469301B (en) * 1991-10-23 1993-06-14 Asea Brown Boveri TRANSFORMER OR REACTOR
SE500238C2 (en) * 1992-08-27 1994-05-09 Asea Brown Boveri Winding frame for a winding with conductor in the form of a superconducting tape
US5895026A (en) * 1996-03-06 1999-04-20 Kelsey-Hayes Company Foil wound coil for a solenoid valve
DE19750064A1 (en) * 1997-11-12 1999-05-20 Cit Alcatel Multiple parallel conductor for windings of electrical devices and machines
JP4573323B2 (en) * 2003-03-10 2010-11-04 谷電機工業株式会社 Winding coil
US9123466B2 (en) * 2013-11-11 2015-09-01 Eaton Corporation Wireless power transfer systems containing foil-type transmitter and receiver coils
US10116230B2 (en) 2013-12-30 2018-10-30 Eaton Capital Unlimited Company Methods, circuits and articles of manufacture for configuring DC output filter circuits
US9590525B2 (en) 2014-07-03 2017-03-07 Eaton Capital Wireless power transfer systems using load feedback
US9984815B2 (en) 2014-12-22 2018-05-29 Eaton Capital Unlimited Company Wireless power transfer apparatus and power supplies including overlapping magnetic cores
US10038324B2 (en) 2015-01-06 2018-07-31 Eaton Intelligent Power Limited Methods, circuits and articles of manufacture for controlling wireless power transfer responsive to controller circuit states
US10116144B2 (en) 2015-05-22 2018-10-30 Eaton Intelligent Power Limited Wireless power transfer apparatus using enclosures with enhanced magnetic features and methods of fabricating the same
US9979205B2 (en) 2015-08-18 2018-05-22 Eaton Capital Unlimited Company Methods and circuits configured to provide for multi-phase wireless power transfer
EP3282457B1 (en) 2016-08-09 2023-06-07 Hitachi Energy Switzerland AG High voltage cable for a winding and electromagnetic induction device comprising the same
JP6624520B2 (en) * 2017-02-28 2019-12-25 株式会社オートネットワーク技術研究所 Reactor
CN107527713A (en) * 2017-10-25 2017-12-29 德清明宇电子科技有限公司 A kind of more spacing magnet ring shells and magnetic ring component
US11990766B2 (en) 2019-07-02 2024-05-21 Eaton Intelligent Power Limited Wireless power transfer apparatus with radially arrayed magnetic structures

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1331077A (en) * 1915-02-27 1920-02-17 Gen Electric Reinforcement for electrical windings
DE415958C (en) * 1924-01-29 1925-07-07 Lorenz Akt Ges C Electric coil made of metal tape or braid of any type of manufacture
US1825105A (en) * 1927-06-15 1931-09-29 Terman Frederick Emmons Inductance coil for radio frequencies
DE592553C (en) * 1931-10-28 1934-02-10 Koch & Sterzel A G High voltage winding, especially for test transformers whose potential is fixed on one side
AT182441B (en) * 1952-05-30 1955-06-25 Bbc Brown Boveri & Cie High-current apparatus with high-current winding consisting of tubular conductors
DE1056730B (en) * 1957-06-14 1959-05-06 Licentia Gmbh Arrangement for the spatial definition of insulating barriers in liquid-filled transformers, converters, inductors, etc. like
DE1155532B (en) * 1959-08-05 1963-10-10 Licentia Gmbh Layer winding for power transformers, especially for autotransformers
BE656743A (en) * 1964-01-06
FR1411081A (en) * 1964-07-08 1965-09-17 Comp Generale Electricite Improvements to alternative windings
US3464043A (en) * 1967-10-16 1969-08-26 Allis Chalmers Mfg Co Conductor strip transformer winding having improved short circuit strength
US3634800A (en) * 1971-01-07 1972-01-11 Mc Graw Edison Co Transformer strip winding
US3691498A (en) * 1971-03-24 1972-09-12 Mc Graw Edison Co Resin impregnated transformer coil assembly
SE376508B (en) * 1973-09-28 1975-05-26 Asea Ab
US4012706A (en) * 1975-12-08 1977-03-15 General Electric Company Sheet-wound transformer coils
SE413716B (en) * 1978-05-02 1980-06-16 Asea Ab POWER TRANSFORMER OR REACTOR

Also Published As

Publication number Publication date
SE7906766L (en) 1981-02-15
ZA804909B (en) 1981-08-26
CH655600B (en) 1986-04-30
GB2057776B (en) 1983-03-09
US4323870A (en) 1982-04-06
DE3029416A1 (en) 1981-03-26
BE884717A (en) 1980-12-01
CA1150375A (en) 1983-07-19
US4471335A (en) 1984-09-11
DE3029416C2 (en) 1986-12-18
FR2463492B1 (en) 1986-09-12
JPS5630711A (en) 1981-03-27
JPS6358362B2 (en) 1988-11-15
GB2057776A (en) 1981-04-01
FR2463492A1 (en) 1981-02-20

Similar Documents

Publication Publication Date Title
SE418234B (en) POWER TRANSFORMER OR REACTOR
US2962679A (en) Coaxial core inductive structures
US3172428A (en) Flexible hose
US4259654A (en) Flux control in tape windings
US4487660A (en) Multiple wall structure for flexible cable using tubular and spiral corrugations
US4379999A (en) Electrostatic shield for a transformer
RU2012110217A (en) OUTLET PIPE
GB2065823A (en) Flexible, multi-layer tubing
US3025483A (en) Magnetic core
US3989885A (en) Support body for the conductors of a low-temperature cable
US4403103A (en) Gas-insulated transmission line having improved outer enclosure
EP0538777B1 (en) Transformer or reactor cooled by an insulating agent
US2401984A (en) Electromagnetic induction apparatus
EP3578862B1 (en) Tube
CA2102467A1 (en) Air core reactor with conductor winding rigidly anchored to structural sleeve
US3336554A (en) Tubular covering and method
US2354500A (en) Insulated coil
US10325700B1 (en) Condenser bushing, transformer and method for producing a condenser bushing
SE417466B (en) power transformer
US2245766A (en) Self-supporting hollow conductor for electric cables
GB1473514A (en) Electrical transformers
RU2178596C2 (en) Coreless-transformer high- and medium-voltage winding
SE510318C2 (en) Rotary electric machine with magnetic core
JPS631384Y2 (en)
GB1605215A (en) Cables

Legal Events

Date Code Title Description
NAL Patent in force

Ref document number: 7906766-6

Format of ref document f/p: F

NUG Patent has lapsed

Ref document number: 7906766-6

Format of ref document f/p: F